Alert archive / Arizona / Flash Flood Warnings in 2025

Flash Flood Warning 82, NWS Phoenix, AZ

October 12, 2025Maricopa County, Pinal County, Arizona

NWS Phoenix, AZ issued this flash flood warning at Oct 12, 2025, 2:38 AM MST for Maricopa County, Pinal County, Arizona. It was in force for 4 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Oct 12, 2025, 2:38 AM MST (09:38 UTC)
Expired: Oct 12, 2025, 6:45 AM MST
In force: 4 hr
Issued by: NWS Phoenix, AZ
Area: Storm-based polygon
Flood severity: None

Counties Maricopa County, AZ, Pinal County, AZ

The radar

The Phoenix radar (KIWA), 29 km from the middle of the area, began a volume at 09:41 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Phoenix, AZ (KPSR), launched 00:00Z, 9.6 hours before the alert went out and 34 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1320 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 35 m²/s²
0-3 km storm-relative helicity: 97 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Phoenix, AZ wrote its last area forecast discussion before this flash flood warning went out at Oct 12, 1:10 AM MST, 1 hour 28 minutes earlier.

Area forecast discussion, Oct 12, 1:10 AM MST, 1 hour 28 minutes before

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In the hours before

Special weather statement, Oct 11, 9:20 PM MST, 5 hours 18 minutes before

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  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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Special weather statement, Oct 12, 2:18 AM MST, 20 minutes before

Special Weather Statement
National Weather Service Phoenix AZ
218 AM MST Sun Oct 12 2025

AZZ552-555-558-121000-
Apache Junction/Gold Canyon AZ-Superior AZ-
Pinal/Superstition Mountains AZ-
218 AM MST Sun Oct 12 2025

...A STRONG THUNDERSTORM WILL IMPACT PINAL COUNTY THROUGH 300 AM
MST...

At 218 AM MST, Doppler radar was tracking a strong thunderstorm near
Florence Junction, or 7 miles south of Gold Canyon, moving east at 25
mph.

HAZARD...Wind gusts up to 50 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Superior, Florence Junction, Queen Valley, and Boyce Thompson
Arboretum.

This includes the following highways...
US Highway 60 between mile markers 204 and 225.
AZ Route 79 between mile markers 144 and 150.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3340 11111 3312 11112 3311 11114 3318 11143
      3321 11146 3334 11146
TIME...MOT...LOC 0918Z 269DEG 21KT 3325 11142

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...50 MPH

18

The office that day

Everything else NWS Phoenix, AZ issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Oct 11, 9:20 PM MST	Special Weather Statement	PSR		25 min
Oct 11, 9:55 PM MST	Severe Thunderstorm Warning	PSR	Gila	15 min
Oct 12, 1:57 AM MST	Flash Flood Warning	PSR	Maricopa, Pinal	8 hr
Oct 12, 2:08 AM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa	4 hr
Oct 12, 2:18 AM MST	Special Weather Statement	PSR	Pinal	42 min
Oct 12, 2:49 AM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa, Pinal	4 hr
Oct 12, 2:58 AM MST	Flash Flood Warning	PSR	Maricopa, Pinal	4 hr
Oct 12, 3:19 AM MST	Special Weather Statement	PSR		26 min
Oct 12, 3:34 AM MST	Severe Thunderstorm Warning	PSR	Maricopa	26 min
Oct 12, 4:20 AM MST	Areal Flood Advisory	PSR	Maricopa	9 min
Oct 12, 4:29 AM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa	3 hr
Oct 12, 6:16 AM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa, Pinal	6 hr
Oct 12, 6:42 AM MST	Areal Flood Warning	PSR	Maricopa, Pinal	3 hr
Oct 12, 6:50 AM MST	Areal Flood Warning	PSR	Maricopa, Pinal	63 min
Oct 12, 6:55 AM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa	4 hr
Oct 12, 7:22 AM MST	Areal Flood Warning	PSR	Maricopa	5 hr
Oct 12, 7:39 AM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa, Pinal	5 hr
Oct 12, 7:46 AM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa	5 hr
Oct 12, 7:48 AM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa	105 min
Oct 12, 7:53 AM MST	Flash Flood Warning	PSR	Maricopa, Pinal	105 min
Oct 12, 7:56 AM MST	Flash Flood Warning Considerable damage threat	PSR	Pinal	5 hr
Oct 12, 8:43 AM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa, Pinal	4 hr
Oct 12, 9:02 AM MST	Flash Flood Warning Considerable damage threat	PSR	Pinal	3 hr
Oct 12, 9:26 AM MST	Flash Flood Warning Considerable damage threat	PSR	Gila, Maricopa, Pinal	3 hr
Oct 12, 9:33 AM MST	Areal Flood Warning	PSR	Maricopa	2 hr
Oct 12, 9:38 AM MST	Areal Flood Warning	PSR	Maricopa, Pinal	7 min
Oct 12, 10:28 AM MST	Flash Flood Warning Considerable damage threat	PSR	Gila	3 hr
Oct 12, 10:35 AM MST	Flash Flood Warning EmergencyCatastrophic damage threat	PSR	Pinal	3 hr
Oct 12, 11:18 AM MST	Areal Flood Warning	PSR	Maricopa	3 hr
Oct 12, 12:51 PM MST	Areal Flood Warning	PSR	Maricopa, Pinal	8 hr
Oct 12, 1:23 PM MST	Areal Flood Warning	PSR	Gila	5 hr
Oct 12, 1:24 PM MST	Areal Flood Warning	PSR	Maricopa	5 hr
Oct 12, 1:44 PM MST	Areal Flood Warning	PSR	Pinal	3 hr
Oct 12, 2:02 PM MST	Areal Flood Warning	PSR	Gila	3 hr
Oct 12, 3:52 PM MST	Areal Flood Warning	PSR	Maricopa, Pinal	6 hr

Nearby

Flash Flood Warnings in Arizona, 2025 Every flash flood warning in 2025

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.